document on new group imports.

pkg/importer/importer.md

@@ -4,4 +4,72 @@
    `\importer\newgroup\newgroup.go`
 
 2. Create a Name const for the group name.
-   `const Name = "New Group"`
+   `const Name = "New Group"`
+
+3. Create a `NfoDate(body)` function that returns the date format used in the `.nfo` file.
+
+```go
+func NfoDate(body string) ( //nolint:nonamedreturns
+	year int, month time.Month, day int,
+) {
+	if body == "" {
+		return 0, 0, 0
+	}
+
+	// DATE : 25.05.2018
+	// DATE : 27-01-2015
+	rx := regexp.MustCompile(`DATE : (\d\d)[\.|\-](\d\d)[\.|\-](\d\d\d\d)`)
+	f := rx.FindStringSubmatch(body)
+	const ddmmyy = 4
+	if len(f) == ddmmyy {
+		y, _ := strconv.Atoi(f[3])
+		m, _ := strconv.Atoi(f[2])
+		d, _ := strconv.Atoi(f[1])
+		return y, time.Month(m), d
+	}
+	return 0, 0, 0
+}
+```
+
+4. Implement `Name` result in the `Group(key)` within `importer.go` file.
+
+```go
+func Group(key string) string {
+	s := PathGroup(key)
+	switch strings.ToLower(s) {
+	case "newgroup":
+		return newgroup.Name
+	}
+	return s
+}
+```
+
+5. Implement `NfoDate()` results in the `ReadNfo()` function found within `record\record.go` package.
+
+```go
+func (dl *Download) ReadNfo(body, group string) error {
+	var (
+		m    time.Month
+		y, d int
+	)
+	switch strings.ToLower(group) {
+	case "":
+		return ErrGroup
+	case "newgroup":
+		y, m, d = newgroup.NfoDate(body)
+	}
+	...
+}
+```
+
+#### If dates are not working, check the rar extracted directories for any `file_id.diz` files. If found, add the following case to the `UseDIZ()` function.
+
+```go
+func UseDIZ(g, base string) bool {
+	switch g {
+	case `newgroup.nfo`:
+      return false
+   }
+	return strings.ToLower(base) == record.FileID
+}
+```